Comparison

Magnetic Field Metal Detector vs Spark Plug Reader

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Magnetic Field Metal Detector

This utility app uses your device's magnetometer to measure magnetic fields, detect EMF, and visualize magnetic data in real-time. It can help identify magnetic metal objects by sensing disturbances in the surrounding magnetic field and offers customizable alerts.

Highlights
  • Magnetic field strength measurement
  • EMF detection
  • Real-time XYZ magnetic sensor data
  • Magnetic field direction indication
  • Customizable threshold alerts
  • Multi-language support
  • Dark mode
Features
Read full description

Magnetic Field Metal Detector is a powerful tool for magnetic field measurement, EMF monitoring, and real-time magnetic visualization using the device’s built-in magnetometer and magnetic sensor. It provides accurate magnetic field readings, XYZ-axis magnetic data, field direction information, and customizable threshold alerts. This app is suitable for magnetic field observation, EMF scanning, and environmental measurement. If a metal object is magnetic or affects the magnetic field in the surrounding area, the app may help you detect the presence of that metal. Features • Magnetic field strength measurement • EMF detection and magnetic field variation monitoring • Real-time XYZ-axis magnetic field sensor data • Magnetic field direction indication • Threshold alerts with sound/vibration • Multi-language support • Dark mode support Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://detector-pro.netlify.app/metal-detector/index.html

About

Spark Plug Reader

Features
Read full description

Plug Read turns a spark plug into a diagnosis, and now it torques the replacement in correctly too. MATCHED BY EYE, NOT BY PART NUMBER Eight appearances, drawn as they come out of an engine. Tap the match and you get what it means and what to check, in the order worth checking it. INSTALL TORQUE, BY THREAD AND SEAT Pick the thread size and seat type, the head material, and get the torque range in both ft-lb and Nm, plus the hand-tight-and-turn fallback for when you do not have a torque wrench. Cross a plug wrong and you either strip the threads or leave it loose enough to blow out under compression, and the difference between right and wrong can be as little as five foot-pounds. THE PLUG IS THE CHEAPEST WINDOW INTO AN ENGINE Five minutes with a plug spanner tells you more about mixture, timing and oil control than an hour of guessing. NO PART NUMBERS, NO DATABASE Nothing here goes out of date, because it works from the plug in your hand and the thread you are installing into rather than a list of engine models. WORKS OFFLINE No account, no signal. The torque table is a published general reference cross-checked across several independent sources, not a measured specification for any specific engine. Manufacturer torque specification always takes precedence.

Screenshots

Magnetic Field Metal Detector3 screens
Spark Plug Reader4 screens

Verdict

The call

The clearest difference is update cadence: Spark Plug Reader at every 2 days against Magnetic Field Metal Detector's every 10 days. Magnetic Field Metal Detector's advantage is iOS requirement (14.0 vs 16.4). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Magnetic Field Metal Detector sells 3 in-app purchases, starting at $1.99 per 7 days and Spark Plug Reader sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Magnetic Field Metal Detector ships an update every 10 days, Spark Plug Reader every 2 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
Magnetic Field Metal Detector versus Spark Plug Reader: the parameters behind the verdict, then further details
ParameterMagnetic Field Metal DetectorSpark Plug Reader
PriceFreeFree
Rating3.8 (14 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings14 — better—
Update frequencyEvery 10 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad
Requires iOS14.0 — better16.4
Further details — not scored
Size3 MB37 MB
Age rating4+4+
Developer三三 杨EVREN YUCEBAS

In-app purchases

3 purchases

Magnetic Field Metal Detector

Subscriptions2
  • Weekly Subscription$1.997 Days
  • Monthly Subscription$4.991 Month
One-time1
  • Lifetime Membership$6.99
1 purchases

Spark Plug Reader

One-time1
  • Full Version$4.99

Questions

Is Magnetic Field Metal Detector free?
Magnetic Field Metal Detector is free to download, with in-app purchases available.
Is Spark Plug Reader free?
Spark Plug Reader is free to download, with in-app purchases available.
Do Magnetic Field Metal Detector or Spark Plug Reader have ads?
Neither Magnetic Field Metal Detector nor Spark Plug Reader shows ads.
Which is updated more often, Magnetic Field Metal Detector or Spark Plug Reader?
Magnetic Field Metal Detector ships an update every 10 days, and Spark Plug Reader every 2 days. Most recently, Magnetic Field Metal Detector was updated on October 30, 2026 and Spark Plug Reader on October 31, 2026.

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